On the dash board is displaying Abs light, check engine light, hand break light, the speedometer goes off, the flow meter also goes off too and the gear display light goes off too

I had this problem for some time now fist I was told the air bags then I'm told can't find the problem the scanner can't pick it up its going to cost me more money to find the problem I been looking on line and I don't understand why no1 thought about the anti-locking braking system I've taken my car to so many mechanics including the Toyota servising need to do more diagnostics to find the problem am I just wasting more money doing that or should I go ahead & get the anti-locking brake system repaired how much would it cost me?